Drill-bit.



J. G. KILGORE.

DRILL BIT.

APPLICATION FILED MAR. 26| |918.

. Lm, Patented June 4,1918.

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JOHN Gr. KILGORE, OF DAYTON, TEXAS.

DRILL-BIT.

Specification of Letters Patent.

Patented J une d, 1918.

Application led March 26, 1918. Serial No. 224,813.

To all whom t may concern.'

Be it known that I, JOHN Gr. KILGORE, a citizen of the United States, residing at Dayton, in the county of Libertyv and State of Texas, have invented certain new and useful Improvements in Drill-Bits, of which the following is a specification.

This invention relates to drill bits for oil wells and has for its object the provision of inexpensive and efficient means whereby the bit will be lubricated in its passage through the earth and the adhesion of gummy or similar substances will thereby be avoided.

The invention is illustrated in the accompanying drawings and will be hereinafter fully described, the novel features being subsequently pointed out in the appended claims.

' ln the drawing- Figure l is an edge elevation, partly in section, of a bit embodying my improvements.

Fig. 2 is a side elevation of the same.

Fig. 3 is a horizontal section on the line 3 3 of Fig. 1.

Fig. 4: is a horizontal section on the line A /l of Fig. l, looking in the direction of the arrow.

F ig. 5 is an enlarged detail vertical section.

The bit illustrated is of the fish tail type, the point or penetrating wedge being in a form closely resembling the tail of a fish and being connected by a reduced neck 2 with a body 3, the said body being externally threaded so as to be secured in the lower end of the tubing. At the juncture of the neck and the threaded portion of the body is an annular enlargement l which provides a stop' to limit the entrance of the bit into the tubing, and through the threaded body are passages 5 having their lower ends opening through the under surface of the enlarge ment 4 so as to permit the oil to pass into and rise through the tubing. ln the under side of the enlargement and the exterior of the neck immediately adjacent the enlargement are grooves 6 into which the upper edge of a covering 7 may be drawn. This covering should be of some absorbent material which will hold oil and may be easily saturated therewith and I employ the pelt of an animal with the flesh side disposed outwardly. The pelt is drawn closely around the neck and the edges of the pelt are then joined by stitching,` as indicated at 8,I and thethread used for thejstitching is passed around the upper edge of the pelt exteriorly thereof, as shown? at 9, so that when the thread is drawn taut the pelt will be held firmly in the grooves 6l and will be stretched smoothly over the neck of the bit. To fur ther aid in holding the pelt in place, transverse openings are formed through the neck, as indicated at 10, and the thread is passed through the said openings, as shown clearly in Fig. 3. At the lower end of the neck and the upper end of the point l, grooves 11 similar in all respects to the grooves 6 are provided and the lower edge of the pelt is drawn into the said grooves and secured therein in the same manner as the upper edge of the pelt is secured in the grooves 6.

The bit is operated in the same manner as other bits now commonly employed for driving oil wells. Before starting operations, however, the covering 7 is secured in place and saturated with some oil and it will be readily seen that an extensive lubricant-containing surface is thereby provided. As the bit is rotated to penetrate the earth the lubricant-carrying pelt will be caused to wipe against the adjacent portions of the earth and the choking of the bit will be thereby avoided and its downward progress facilitated. The adhesion of gummy substances which may be contained in the ground will be also obviated. Surplus oil which may be in the pelt will collect into the lower grooves 1l and will overflow in a thin stream over the point 1 and will, consequently, lubricate the point so that it will perform its proper functions readily and without a tendency to choke. The construction is such that the pelt or other absorbent vehicle will be held closely and smoothly to the bit and may be easily removed when worn out and a new pelt substituted. The cost of the lubricating carrier will be trifling and it may readily be applied to any bits now in use.

Having thus described the invention, what claim as new is:

l. A drill bit having an absorbent lubricant carrier secured thereabout.

2. A drill bit comprising a point, a body and a reduced neck connecting the point and the body, and an absorbent lubricant c`ar rier secured around the said neck.

3. A drill bit comprising a point, a body and a reduced neck connecting the body and the point, and a exible absorbent lubricant carrier tted snugly about the neck and coterminous therewith.

4. A drill bit comprising a point, a body, a reduced neck connecting the point and the body and provided at itsends With external grooves merging into the adjacent surfaces of the point and body respectively, a flexible absorbent lubricant carrier Wrapped about the neck, and means for securing the edges of said carrier in said grooves.

5. A drill bit comprising a point, a body and areduced neck connecting the point and the body, the said neck being provided at its ends with external grooves merging into the adjacent surfaces of the point and the body respectively and being further .provided with transverse openings communicating with the said grooves, a flexible absorbent lubricant carrier Wrapped about the neck, means for joining the meeting edges of said carrier, and means passing about the ends of the carrier and through the transverse openings in the neck to secure the ends of the carrier in the said grooves and to the 25 neck.

In testimony whereof I aflix my signature.

JOHN G. KILGORE. [n s] Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, .D. C. 

